When moving to source view full screen please allow left arrow to go back

**Is your feature request related to a problem? Please describe.**
In "Status [1]" tab, you can navigate right to the source code with right arrow. But then you have to hit escape to navigate back left.

**Describe the solution you'd like**
Please make left arrow navigate left.

**Describe alternatives you've considered**
Escape.

**Additional context**

now I click "right arrow"


Now I can't go back left with left arrow. Only with Escape I can go back.

Thank you for gitui it is amazing.